Is bactroban sold over the counterif you are taking any other prescription or nonprescription (over-the-counter [OTC . . . . . . It works by . . . Uses For Bactroban. . . Mupirocin is used to treat bacterial infections. . . . . . Over the counter medicine example?Best Answer: Depending on what kind of insulin you want you may be able to get it without a prescription. I think question is asking why are some drugs sold over-the-counter and other drugs sold . Traditional / Proprietary medications... more